These Mainstays 5 Quart/1.25 Gallon Storage Containers are on sale for only $12.50 (reg $25)! Plus, get free shipping when you ship to store or with your $35+ order. (commissioned link) P.S. We use boxes like this for LEGO sets. We keep all of the pieces (or full put-together sets) and instructions together and then stack them up . 

Shop here — https://rstyle.me/+94itQAc9bXZiNZ2992WPSQ